September weather forecast and climate
Cooke City, MT

Weather in September

September, the first month of the autumn, in Cooke City, is still a pleasant month, with average temperature ranging between max 68.7°F (20.4°C) and min 48°F (8.9°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 77°F (25°C) in August, to a pleasant 68.7°F (20.4°C). In Cooke City, the average low-temperature is 48°F (8.9°C).

Humidity

In Cooke City, the average relative humidity is 47%.

Rainfall

In Cooke City, during September, the rain falls for 9.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Cooke City, during the entire year, the rain falls for 138.8 days and collects up to 16.14" (410mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows in Cooke City, Montana. Throughout September, in the average 1.5 snowfall days, it receives 1.54" (39mm) of snow. In Cooke City, during the entire year, snow falls for 92.3 days, and aggregates up to 55.83" (1418mm) of snow.

Daylight

The average length of the day in Cooke City is 12.5h.

Sunshine

In September, the average sunshine is 10.7h.

UV index

In Cooke City, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Cooke City?

The average high-temperature, in September, in Cooke City, is 68.7°F (20.4°C), while the average low-temperature is 48°F (8.9°C).

What is the average humidity in September in Cooke City?

In September, the average relative humidity in Cooke City, Montana, is 47%.

How much does it rain in Cooke City in September?

In September, in Cooke City, the rain falls for 9.3 days. Throughout September, 0.98" (25mm) of precipitation is accumulated.

When does it start to snow in Cooke City?

September is the first month it typically snows in Cooke City, Montana. Throughout September, in the average 1.5 snowfall days, it receives 1.54" (39mm) of snow.

What is the average length of the day in September in Cooke City?

In September, the average length of the day is 12.5h.

How many hours of sunshine does Cooke City have in September?

In September, the average sunshine in Cooke City, Montana, is 10.7h.

How high is the UV index in September in Cooke City?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Cooke City, MT

Average temperature in September - Cooke City, MT
  • Average high temperature in September: 68.7°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is December (27.5°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is July (56.1°F).
The coldest months (with the lowest average low temperature) are February and December (14.9°F).

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Average pressure in September
Cooke City, MT

Average pressure in September - Cooke City, MT
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in September
Cooke City, MT

Average wind speed in September - Cooke City, MT
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
Cooke City, MT

Average humidity in September - Cooke City, MT
  • Average humidity in September: 47%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in September
Cooke City, MT

Average rainfall in September - Cooke City, MT
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is December (0.55").

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Average rainfall days in September
Cooke City, MT

Average rainfall days in September - Cooke City, MT
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is November (5.7 days).

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Average snowfall in September
Cooke City, MT

Average snowfall in September - Cooke City, MT
  • Average snowfall in September: 1.54"

The month with the highest snowfall is April (9.37").
Months with the least snowfall are July and August (0").

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Average snowfall days in September
Cooke City, MT

Average snowfall days in September - Cooke City, MT
  • Average snowfall days in September: 1.5 days

The month with the highest number of snowfall days is February (14.8 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Cooke City, MT

Average daylight in September / Average sunshine in September - Cooke City, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).

  • Average sunshine in September: 10.7h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 6.5h).

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Average sunshine days in September
Cooke City, MT

Average sunshine days in September - Cooke City, MT
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is December (17.4 days).
The month with the least sunshine days is May (5.1 days).

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Average UV index in September
Cooke City, MT

Average UV index in September - Cooke City, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Cooke City, MT

Average cloud cover in September - Cooke City, MT
  • Average cloud cover in September: 17

The month with the most cloud cover is February (Cloud cover 36).
Months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in September
Cooke City, MT

Average visibility in September - Cooke City, MT
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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